5.4 and 4.6L heads are the same, so are the cams. Blocks are different. However... make sure the heads you have are PI heads. Mustangs went to PI heads in 99 but some vehicles including some of the trucks did not until a few years later.

There are also Windsor vs Romeo heads but they are all compatible except you need to have Windsor valve covers for Windsor heads and Romeo valve covers for Romeo heads. Windsors have 13 valve cover bolts, Romeos have 11.

Unless you have a 99 or 2000 mustang GT, you are going to need different timing covers to make that work. ALl of the 5.4 engines were made at the Windsor plant. Most of the mustang engines were made at romeo, but the 99 and 00 were windsor. Not sure about 96 and 98 though

Unless you have a 99 or 2000 mustang GT, you are going to need different timing covers to make that work. ALl of the 5.4 engines were made at the Windsor plant. Most of the mustang engines were made at romeo, but the 99 and 00 were windsor. Not sure about 96 and 98 though

No, he just needs the correct size hardware. I'm putting a 2000 cover on a 2005 for example, it bolts right on with the correct bolts.

When you say correct bolts what do you mean, longer, shorter, larger diameter or thread type ?

Is this true for a 1998 as well

Romeo heads and Windsor heads use a slightly different size bolt where the timing cover attaches to them. I'm just going to use the stuff that came with the Marquis motor I got, if that doesn't work then its a trip the the hardware store.

Bolt hole locations are the same. I'm just swapping everything on the front assembly from my 2000 Windsor to my 2005 Romeo because I don't feel like having to guess at the blower mounting and the blower belt tensioner and routing.

Keep all the hardware from your 2000. Swap everything from the Mustang from the cover to all the accessories and tensioners over to the 2005 "Vic" 2V you are getting. Even if it was the same year as your mustang the accessories are different. You may even have to swap the water pump which is a good excuse to replace it unless its real low mileage, then just a new gasket and go.

I believe so but not 100%. PI cams are PI cams. I do not think they are different in the trucks but he can always just swap his cams if he's worried about it. Manifold for a 5.4 is wider though, not compatible and I don't even like using lower mileage used PI manifolds honestly. They all warp under the tstat housing and leak after awhile. Although a new FRPP one will last a good while.

I believe so but not 100%. PI cams are PI cams. I do not think they are different in the trucks but he can always just swap his cams if he's worried about it. Manifold for a 5.4 is wider though, not compatible and I don't even like using lower mileage used PI manifolds honestly. They all warp under the tstat housing and leak after awhile. Although a new FRPP one will last a good while.

There in lies the problem. I didn't realize the expy and trucks got the pi treatment.